I buy one of those 59 cent little spiral notebooks before I go on a solo trip, and I carry it almost everywhere. When I have free time (such as when I'm sit down dining solo), I take it out and jot down notes on where I've been, what rides I rode, any particular comments, food I ate, etc. When I get home, it goes into my big ziploc bag of souveniers from my trip. I don't usually bring a book for several reasons-for one thing, if you're reading a book, you may not see some "people-watching" opportunities; also, maybe someone wants to approach you and talk to you, maybe ask you a question, but if you appear to be engrossed in a book, they're reluctant to interrupt. And, like someone else said, sometimes a whole paperback book is just too cumbersome to haul around. Remember, solo trips are all about freedom!